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A new scoring system, using Doppler transmitral diastolic measurement, identifies transient myocardial ischaemia
N Kolev1, H Berkemeier, G Ihra
1Department of Anesthesiology and Intensive Care, University Hospital of Vienna, Austria.
Insights
A new scoring system using Doppler echocardiography can detect perioperative myocardial ischemia by analyzing left ventricular filling. This method helps identify acute changes during surgery, improving patient monitoring and treatment strategies.
Area of Science:
- Cardiology
- Echocardiography
- Physiology
Background:
- Acute transient myocardial ischemia affects left ventricular filling, altering diastolic flow and relaxation.
- Assessing perioperative ischemia is crucial, especially in patients with coronary artery disease or those at risk.
Purpose of the Study:
- To evaluate perioperative transient myocardial ischemia using a novel scoring system.
- To assess the utility of Doppler transesophageal echocardiography in identifying ischemic events.
Main Methods:
- A scoring system was developed using isovolumic relaxation time and transmitral flow velocity indices.
- Doppler transesophageal echocardiography (TEE) was employed in a midoesophageal left ventricular four-chamber view.
- Key Doppler parameters included E/A ratio, deceleration time, deceleration rate, and isovolumic relaxation time.
Main Results:
- The study involved 53 patients with known or at-risk coronary artery disease.
- The scoring system was used to evaluate ischemic events during the perioperative period.
- Diastolic dysfunction was observed to be common during ischemia.
Conclusions:
- A scoring system derived from Doppler echocardiography can evaluate perioperative transient myocardial ischemia.
- Recognizing ischemia-induced diastolic dysfunction can guide perioperative monitoring and treatment.
- Limitations of 2D scoring systems highlight the importance of Doppler-based evaluations.
Abstract:
In patients with acute transient myocardial ischaemia, changes in left ventricular filling produce alterations in transmitral diastolic flow velocity and isovolumic relaxation time. In this study a scoring system derived from isovolumic relaxation time and indices from transmitral flow velocity was used to evaluate perioperative transient myocardial ischaemia. Fifty three patients with known coronary artery disease or at risk were studied. Ischaemic events were assessed using Doppler transoesophageal echocardiography midoesophageal left ventricular four-chamber view planes. Diastolic Doppler ratios of peak early to atrial peak (E/A), deceleration time, deceleration rate and isovolumic relaxation time were scored using standard methods. An evaluation of peri-operative ischaemic events could be important for patients with a non-ischaemic cause for abnormal segmental wall motion, as the use of a two-dimensional scoring system has limitations. Acute changes in the Doppler ratio of peak early to atrial peak must be interpreted cautiously during surgery. Diastolic dysfunction commonly occurs during ischaemia and recognition of this may alter the approach to monitoring as well as to treatment.